Corporate Information

Press Release (Jul 06,2012)
Status of TEPCO's Nuclear Power Stations after the Tohoku-Chihou-Taiheiyou-Oki Earthquake (Daily Report as of 3:00 PM, July 6)

Due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake which occurred on March 11, 2011, TEPCO's facilities including our nuclear power stations have been severely damaged. We deeply apologize for the anxiety and inconvenience caused.
With regard to the accident at Fukushima Daiichi Nuclear Power Station, on April 17, 2011, we have compiled the roadmap towards restoration from the accident and on July 19 we accomplished the Step1 target "Radiation dose is in steady decline". Then on December 16 we confirmed the accomplishment of the Step 2 target "Release of radioactive materials is under control and radiation doses are being significantly held down".
In addition, on December 21, 2011, we have compiled the "Mid-to-long-Term Roadmap toward the Decommissioning of Fukushima Daiichi Nuclear Power Units 1-4, TEPCO".
In addition to the maintenance of the plant's stable condition, we will implement Mid-to-Long Term countermeasures towards the decommissioning of Fukushima Daiichi Nuclear Power Units 1-4 to enable evacuees to return to their homes as soon as possible and reduce the anxiety of the people in Fukushima and the whole nation as soon as possible.

Below is the status of TEPCO's nuclear power stations (Fukushima Daiichi and Fukushima Daini).

*The updates are underlined.

[Fukushima Daiichi Nuclear Power Station]
・Unit 1 to 4: Abolishment (April 19, 2012)
・Unit 5 to 6: Outage due to regular inspections before the earthquake

-At 10:00 am on July 5, we started transferring accumulated water from unit 6 turbine building basement floor to a temporary tank. At 4:00 pm same day, the transfer was stopped.

-At 10:06 am on July 6, we started transferring accumulated water from unit 3 turbine basement to Concentrated Waste Disposal Facility (Solid Waste Disposal Building [High Temperature Combustion Building])

-At 6:24 am on June 30, the alarm of the spent fuel pool substitution cooling system of unit 4 went off, showing that there was a system error, and the cooling system automatically stopped. After that we confirmed that there was no leakage at the site. During the investigation on the same day it was assumed that there was a problem in the UPS (Uninterruptible Power Supply) so we started bypassing works around the suspected UPS from 1:35 pm on July 1 and completed the bypass line at 2:45 pm on the same day. The cooling system was restarted at 3:07 pm. At 11:58 am on July 5 we stopped the cooling system in order to remove the UPS and analyze the reason of malfunction. At 1:15 pm on the same day we restarted the cooling system (temperature of the pool at the time the cooling system stopped and the time it restarted was both 32℃) . Since we identified soot in the removed UPS, we reported to Tomioka fire Department at 5:20 pm on the same day. At 10:35 am on July 6, the investigation by the Tomioka Fire Department concluded that it was not caused by a fire. From now on, we plan to improve the condition of control panel where the UPS is installed, replace the USP, and resume the normal status of power source of control systems.

[ Fukushima Daini Nuclear Power Station ]
・Unit 1 to 4 : Shutdown due to the earthquake.

Appendix: Past Progress (As of 3:00 pm, on July 6, 2012) (PDF 442KB)
Appendix: Past Progress (From March 11, 2011 to December 31, 2011) (PDF 523KB)
* Revised past progress

The aforementioned attachments are only available in Japanese.
We apologize for any inconvenience this may cause.
back to page top

to TOP